diff --git a/src/panels/lovelace/cards/hui-weather-forecast-card.ts b/src/panels/lovelace/cards/hui-weather-forecast-card.ts
index 211d608332..74f0151a2e 100644
--- a/src/panels/lovelace/cards/hui-weather-forecast-card.ts
+++ b/src/panels/lovelace/cards/hui-weather-forecast-card.ts
@@ -303,6 +303,10 @@ class HuiWeatherForecastCard extends LitElement implements LovelaceCard {
   }
 
   private _measureCard() {
+    if (!this.isConnected) {
+      return;
+    }
+
     this._narrow = this.offsetWidth < 375;
     if (this.offsetWidth < 300) {
       this.setAttribute("verynarrow", "");